Improvement in grate-bars



2 Sheets-Sheet 1.

' T. MURPHY. GRATE-BAR.

'Patented Nov.

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T. MURPHY. @RATE-BAR.

\ N. PEIERS. PHOTO-LITHDGQAPHER, WASHINGTON. D C.

Arm

THOMAS y MURPHY, OF DRrRorr, MICHIGAN.

y IMPROVEMENT IN GRATE-RARS.

Speeieation forming part of Letters Patent No. 169,655, dated November9,1875; application filed April 17, 1875. f

To all whom 'it may concern Be it known that I, THOMAS MURPHY, ot'Detroit,l in the county of Wayne and State of Michigan, have invented anImprovement in Furnace-Grates, of which the following is a specificationY My invention has for its object to provide the furnace of asteam-boiler-heating furnace or stove with a grate which will permit agreater volume of air to pass into and through the superimposedincandescent fuel, and thereby enable all kinds of coal, but moreespecially slake and refuse coals, to be successfully burned; also, toso arrange the grate-bars as that every second one may be vibrated tofree the grate from ashes, and to collect the clinkers and refuse atcertain points where they can be removed or ground up, and then removedby toothed cylinders rotated by cranks on the outside of the furnace.

Figure 1, Sheet l, is a perspective view of the furnace of a marineboiler, nearly all the front of the same being broken away to show myimproved grates applied thereto. Fig. 2, Sheet 2, is a cross-section ofthe grates, their supports, and the operative parts. (Seen in Fig. l.)Fig. 3 is a perspective view of one of the grate-supportingframes. Fig.4 is a similar view of a toothed cylinder used for grinding clinkers andremoving ashes. Fig. 5 is a similar View of a feathered rock-shaft forvibrating the grate-bars. Fig. 6 is a detached perspective view of atriangular stationary grate-frame. Fig. 7 is a similar view of anintermediate triangular vibrating grate-frame. Fig. 8 is a similar viewof one of the stationary inclined bars, such as are erected at the sidesofthe furnace. Fig. 9 is a similar View of an intermediate vibratingbar.

In thedrawin g, A represents a pair ofparallel bars, east with girthsconnecting them at the ends and intermediately, making aframe which canbe supported longitudinally in a furnace by bars or brackets on thefront and back walls thereof. ln the furnace shown three of these framesare employed but in a narrower one two,

.or but one alone, may be necessary. The girths of each frame arehollowed on the upper edge to receive and support a toothed cylinder, B,whose front end extends through a thimble in the front leg of thefurnace, or beneath the front ries of bars set up at an angle of aboutforty-five degrees, as circumstances may require, against the furn acesides, supported at the lower` ends by the outer edge of the frameA,tl1e lowerM ends of the bars being notched to projectover 'the 4edgeof said frame. There is a pendent "lugat the lower end of each bar D,with a pearshaped opening in it. There is also an enlargement of theupper end on one side, to form a spacer, through which a hole, f, iscored in cast-- ings D is a bar of nearly the same shape, havingapivOt-lug, f', on its upper end to insert in the hole j' of the bar D.Between each pair of said bars it is intermediately placed. Instead ofthe open lug at the lower end, it has a segment-shapedlug with a notch,c', in its upper side, in which the rib cof a rock-shaft, C, enters. Thefront end of the rock-shaft extends either through a thimble in thefront leg of the furnace, or through the draft-Open ing; and, whenoscillated by a crank, the feather c of the rock-shaft engages with thenotches of all the bars D', and vibrates them, freeing the grates ofashes, and carrying the partially-consumed coal and the clinkers to thelower ends of the grate-bars, and upon the toothed cylinders B. E is oneof a series of triangular grate-frames, havin ga notch at each end toengage with the side bar of a frame, A, it being placed between twocontiguous frames A, on whichit rests. The bottom piece or girth of eachframe E is hollowed out to form a bearing for the rock-shaft C, whosefront end, like the Others, projects through a thimble in theboiler-front, or into the draft-opening. E is a similar fram c, butwithout the notches at the ends,

and is intermediately placed between pairs of the frames E, its endsresting upon the frames A. lts girth has a socket, t', in the loweredge, which receives the rib of the rock-shaft, which,

when oscillated on its axis, vibrates all the frames E( in the serieslaterally to and fro, freeing that part'of the iire-bed from ashes, andthrowing the unconsumed coal down toward thefoot, and the clinkers uponthe cylinders B, which grind and remove them when rotated.

. Fresh fuel is thrown on the tops of the gratei'raniesand tops ofptheinclinedv bars at the sids'of the furnace', and there remains untilcoked and partially consumed, until the time for tiring the furnace thenext time, when the incandescent coke may be pushed offby the fire-hoe,or by vibratingf'the grates Fresh fuel being then introduced and thrownupon the incandescent mass, Will have its gases ignited and consumedwhile cokin`g,owing to the free admixture ot'large volumes ofatmospher-- 4 ic airfatl a veryT high temperature.

In afurnacev of less Width than that shown one set of the-triangulargrates may be omitted 5 as also the intermediate toothed cylinder 5 andin a very narrow or contracted furnace i the'said. triangular grat'esmaybe omitted altogether, using `only the inclined grates at the sides,Vand an intermediate 'clinker-grinding cylinder. 1 A It is evident thatthese grates may be modied.' in arrangement to suit the requirements Yof various forms of air-heating and other stoves andfurnaces.Withoutdeparting from the spirit ofmyinvention.

i' lWhat Ij claim as my invention, andfdesire to secure byLettersPatent, is-A The combination of two sets ofalternat.` ing and inclinedbars, D D, with a support-` ing bars D D', substantially as describedand shown.

3. The combination, with the frames A, of the triangular grateframes EE', in an alternating series, the said frames E being susceptible of alateral vibration from the rockshaft C, hung in the frames E,substantially as and for the purpose set forth.

4. In a furnace or fire-box, the combination of'tWo sets of transversegrate-bars, inclined from the sides of the-re-box toward each irnos.MURPHY.

' Witnesses:

' H. F. EBERTS, C. E. HUEsTIs.

